1. I'm going to travel in Europe this summer vacation.
2. I'm going to travel to Europe this summer vacation.
(What is the difference between the two setences? Are "travel in," and "travel to" interchangable?)
Both sentences mean about the same. The implication for 1 is that you'll visit several countries while you're IN Europe. The 2nd sentence states that you're going TO Europe, but says nothing about going to more than one country.
The two sentences have slightly different meanings:
1. "I'm going to travel in Europe this summer vacation."
This sentence implies that you will be traveling within the countries or regions of Europe during your summer vacation. It suggests that you will be visiting multiple places within Europe.
2. "I'm going to travel to Europe this summer vacation."
This sentence suggests that you will be traveling from a place outside of Europe to any specific destination within Europe during your summer vacation. It implies a single location or country in Europe as your destination.
In terms of interchangeability, it depends on the context and what you want to convey. If you are planning to visit multiple places within Europe, the first sentence might be more appropriate. If you are referring to going to a specific location in Europe, the second sentence may be more fitting.